Sink current problems about my LED driver

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HI! I'm new here.

I have a TI TLC5944 LED driver, and when I read its datasheet, I met some problem.

The datasheet says that the "constant current sinking" capability is 60-mA.(LED Power supply voltage up to 15 Volts, and Vcc=3.0V to 5.5 V )

 

My understanding is if Sink current is low, then its better as it will not heat-up my LED driver chips.

 

1- I want to understand What is the importance of High (or Low) LED driver Sink current?

2- Why we do not talk about sourcing Current instead?

 

Thanks for any answers.

You might want to ask this query from TI since it's about their driver.